definition
strict definition
fiberglass loose fill
Glass fibers stuffed loosely into wall or roof cavities for thermal insulation.
Fiberglass loose fill insulation consists of unbound masses of glass fibers stuffed or packed into cavities or open layers in walls or roofs for thermal insulation. If the fibers are bound together in any kind of sheet or mat, then they are not considered loose fill.
The glass fibers remain unbound within the insulated cavity or open layer. A bagged, sheet-like, or matted product is a different insulation form.
The usage identifies both the glass-fiber material and its loose arrangement. Mineral-wool loose fill has a similar fibrous form but a different raw material.
Related definitions
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cellulose loose fill
Particles or loose pieces of organic plant fiber used as thermal insulation. -
granulated cork
Granules of cork-oak bark used as loose thermal insulation in wall or roof spaces. -
hemp loose fill
Loose hemp fibers packed into wall or roof cavities as thermal insulation, generally from low-psychoactivity plant varieties. -
mineral wool loose fill
Unbound mineral fibers used as loose thermal insulation, including rock wool and blast-furnace slag wool. -
perlite loose fill
Loose expanded perlite particles used as thermal insulation, made by heating naturally occurring volcanic glass. -
straw bales
Bales of straw from grasses such as wheat or rice used as thermal insulation within a building assembly. -
vermiculite loose fill
Loose expanded particles of vermiculite mineral used as thermal insulation in building spaces.